Perancangan dan Analisis Kinerja Pengkodean Audio Multichannel dengan Metode Closed Loop

Abstract

The latest international standardized codec is MPEG Surround. But the open-loop system of the MPEG Surround not able to minimize errors. In this research, the design and performance analysis of the audio coding in MPEG Surround with closed-loop method which can minimize the occurrence of errors on multichannel audio compression was applied. The implementation of closed-loop method increase the value of Signal to Noise Ratio (SNR). The average value of SNR for all bit rate for open-loop and closed-loop method are 17.67385 dB and 23.82338 dB, respectively. The highest SNR increase reaches 82.72% in comparison with the open-loop method. The average value increase of Objective Difference Grade (ODG) for the entire audio sample is equal to 0.143917. In perceptual objective test and subjective tests indicate that the MPEG Surround with closed-loop method works better than the open-loop method. Overall, the impairment of audio compression is imperceptible at bit rate 90 kbps or higher.

Keywords

• Multichannel Audio
• MPEG Surround
• Closed loop